Research On Displacement Monitoring Model And Monitoring Index Of Concrete Arch Dam

Dam is of importance for national development, and the safety of dam is very important too. Nowadays all nations estimate the safety of dam by monitoring the influencing quantity of the dam, such as displacement and pressure. Then administrators analyze the data collected from the dam and set up monitoring model or monitoring index of influencing quantity. Using the analyzed results the principal can take any measure to make sure the dam is on safe state. In many item of dam, the displacement can reflect the state of dam generally, meanwhile, the displacement is easy to survey and the precision of data is rather high. So the displacement of dam is very useful to us. We can establish the displacement model and displacement index with the surveyed data. Then the model and index can instruct the manager to make a right decision on dam business. However, there are many shortages of displacement model. For example, the model is established with one point on the dam; it is hard to reflect the whole situation of the dam. At the same time, the deterministic model with a higher forecast performance is less applied because of lots of temperature of the dam is needed. In many application the mutual effects between hydraulic pressure displacement and temperature displacement is ignored. Those affect the precision and usage of displacement deterministic model. So those problems need to research deeply.This dissertation discussed the way to build a one-dimension displacement model of concrete arch dam with high precision in the following conditions: there isn't enough temperature data in the dam; model takes the mutual effects between hydraulic pressure displacement and thermal displacement into account. On the basement of the one-dimension model the displacement index equation of typical section is built. As a method this way is suitable to other concrete arch dam.To many concrete arch dams, statistical model hasn't better forecast function comparing to deterministic model. However, the problem is that there isn't enough temperature data to build a deterministic model. How to determine the thermal displacement is magnitude because the thermal displacement is big in proportion to total displacement. In this paper the whole edge temperature of arch dam is estimated by the air temperature. Then analyze the temperature field and displacement field of the dam with FEM. Finally the deterministic model of concrete arch dam is built up.The water temperature is a part of dam temperature boundary and is estimated by the method of criterion through air temperature. The equation that recommended by the concrete arch dam design criterion has a hypothesis: the water level of the reservoir is fixed. But the actual water level is mutative. So the fact that water boundary affects thermal boundary is overlooked in the analysis. The result is that the mutual effects between hydraulic pressure displacement and temperature displacement are ignored in deterministic model too and the precision of the model is down. This paper takes the effect into account when determining the temperature boundary. So the simulation is more close to the real situation and the mutual effect is embodied in the model.Displacement models are a-point models in nowadays application. This kind of model is built up easily. But this model doesn't indicate the dimensional displacement of dam and is easily interrupted. In this dissertation one-dimension displacement deterministic model will be established. The relationship between the displacements of different points could be embodied.In all, this paper gives a way to build up displacement deterministic model under all-around considerations. Then the thoughts are applied to GeHeYan arch dam in Qing River. The result is pretty good. This illuminates that the method is feasible. This method is valuable to all other concrete arch dam.